Hyperbaric pressure - 211 entries found
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Problems associated with fire service operations in pressurised atmospheres
This bulletin describes the effects of working in pressurised atmospheres when wearing breathing apparatus and recommends different types of breathing equipment for different pressures. Individual sections are devoted to: the effects of increased pressures on the body; the release of pressurised gases in the body; the effects of wearing breathing apparatus; the provision of special breathing apparatus; types of apparatus; spare cylinders; airline equipment; special breathing apparatus for pressures above 0.82atm gauge; effects of increased pressure on the operation of low-cylinder-pressure warning devices.
H.M. Stationery Office, P.O. Box 569, London S.E.1 9NH, United Kingdom, Jan. 1972. 9p.
Hyperbaric chamber noise during a dive to 100ft.
Diving in hyperbaric chambers can produce both temporary and permanent threshold shifts. The purpose of the present study was to determine the noise levels in such a chamber during compression to a simulated depth of 30m of sea water. The experimental procedure is described, and the results discussed. Peak noise levels during descent and ascent were in the 2400-4800 Hz octave band (112-108dBA and 120-115dBA, respectively, depending upon the microphone position).
Journal of the Acoustical Society of America, Apr. 1972, Vol.51, No.4 (Part 2), p.1362-1365. Illus. 7 ref.
Peters T., Terhaag L.
Permanent occupational injury in caisson workers
Bleibende Berufsschäden bei Caissonarbeitern [in German]
Following a brief review of the mechanism of caisson disease and the differential diagnosis of the bone lesions, T. Peters surveys the permanent skeletal lesions due to compressed-air work. His conclusions are based on the results of a questionnaire and radiological examination of 25 one-time caisson workers aged 50-70 years. The most remarkale findings were bone infarctions. L. Terhaag considers permanent internal-organ lesions. Having reviewed the conditions in caissons, he reports on clinical examinations (vision, hearing, lungs, blood, circulation) of the same 25 workers. Caisson work may favour the appearance of pulmonary emphysema.
Heft 7, Beiträge Arbeitsschutz und Arbeitsmedizin, Deutsche Gesellschaft für Arbeitsschutz, Hamburger Allee 26-28, 6 Frankfurt am Main 90, Federal Republic of Germany, 1972. 80p. Illus. 52 ref.
Review of protective pharmocological agents in diving
A selective review of the literature relating to pharmaceutical agents capable of preventing or reducing decompression sickness, oxygen toxicity and inert gas narcosis in diving. These 3 hazards are considered and the direction of contemporary research on the use of drugs is indicated.
Aerospace Medicine, Feb. 1972, Vol.43, No.2, p.184-192. 89 ref.
Coagulation changes in experimental decompression sickness
Gerinnungsveränderungen bei der experimentellen Dekompressionskrankheit [in German]
Treatment of decompression sickness cannot be limited to purely physical recompression, since the course of the disease is dependent much more on the biohumoral reactions of the body than on the size of the gas bullae. Animal experiments to determine coagulation changes immediately following decompression, clearly indicate the presence of coagulation disorders. The thrombocyte count proved a significant indicator of coagulation disorders. Therapeutic experiments on these disorders showed that heparin and Trasylol had a favourable effect. It is considered that acetyl salicylic acid therapy of coagulation disorders is inadequate.
Ärztliche Praxis, 27 June 1972, Vol.24, No.52, p.2753-2755. Illus. 4 ref.
Lesions of the nervous system in decompression sickness
Translation of a Russian-language article in "Voprosy psihiatrii i nevropatologii", Moscow, USSR, Vol.13, p.615-622. After indicating the cause and occurrence of decompression sickness (DS) the author examines symptoms of the disease as it affects the nervous system, based on a study of 49 divers and caisson workers. In most cases, neurological disorders became less apparent in less than 30min after decompression, and there were multiple effects on the nervous system although some patients exhibited symptoms indicative of an effect on a particular area of the nervous system. Cases exhibiting symptoms of cerebral and spinal forms of DS and their effects are described. Involvement of the peripheral nerves in isolated form rarely occurs. Results of the author's experiments on rabbits and cats to discover the mechanism by which the nervous system is affected. The author considers that curative recompression is a very effective method of treating DS.
Defence Research Information Centre, Ministry of Defence, Main Building, Whitehall, London SW1A 2HB, United Kingdom, May 1972. 10p. Illus. 6 ref.
Psychological aspects and psychotechnical testing of underwater workers
Aspetti psicologici e valutazione psicotecnica dei lavoratori subacquei [in Italian]
Psychological factors in underwater workers are radically different to pleasure-driving motivation and vary in relation to the type of work (caisson work, constant volume suit diving, SCUBA diving). The author considers the effects of pressure on mental faculties, with reference to the literature, the sensory isolation syndrome and the neuropsychic depth syndrome, and the necessary mental qualities (which vary between caisson workers, constant-volume divers and SCUBA divers); he considers psychotechnical testing essential and indicates the form it should take. Safety measures are reviewed (inclusion of psychotechnical testing in periodic medical examinations, electroencephalography, cerebral theography, psychotechnical-examination card to form part of the driver's personal medical record, compulsory training, health education).
Folia medica, Dec. 1971, Vol.54, No.12, p.265-280. 24 ref.
Shilling C.W., Werts M.F.
An annotated bibliography on diving and submarine medicine
This volume contains 1,914 abstracts covering the literature of submarine and deep sea diving medicine and closely related subjects published between 1962 and 1969. The abstracts are arranged alphabetically by author, and retrieval is achieved by means of a comprehensive, manually produced permuted index of key words. There is also a complete author index.
Gordon and Breach Science Publishers, 440 Park Avenue South, New York, NY 10016, USA, 1971. 622p.
Medical manual on diving
Medizinische Tauchfibel [in German]
Contents: brief survey of various types and methods of diving; physical laws (pressure, laws concerning gases); physiological phenomena (impairment of sight, hearing and speech, breathing, circulation, body cavities) caused by diving; accidents (drowning, diver's bends, decompression injuries, hazards due to gas inhaled, faulty reactions, hazards due to temperature); safety rules; first aid; medical treatment and supervision; decompression rules and tables; treatment in case of decompression accidents.
Springer-Verlag, Heidelberger Platz 3, D-1 Berlin 33, 1971. 100p. Illus.
Ordinance of 20 Jan. 1961 on technical measures for the prevention of accidents and occupational diseases in compressed air work [Switzerland]
Verordnung vom 20. Januar 1961 über die technischen Massnahmen zur Verhütung von Unfällen und Berufskrankheiten bei Arbeiten unter Druckluft [in German]
Ordinanza del 20 gennaio 1961 concernente le misure tecniche di prevenzione degli infortuni e delle malattie professionali nei lavori in aria compressa [in Italian]
Ordonnance du 20 janvier 1961 concernant les mesures techniques de prévention des accidents et des maladies professionnelles lors des travaux dans l'air comprimé
[Suisse] [in French]
Contents of this Ordinance (effective 1 Feb. 1961): general safety measures; notification of compressed-air work; required qualification of compressed-air workers; particular safety measures for caisson work and for work involving diving equipment; use of light portable diving apparatus. The decompression table and the first aid guide in the annex have been repealed.
SUVA, Sektion Administration, Postfach 4358, 6002 Luzern, Switzerland, 1963. 19p.
http://www.admin.ch/ch/d/sr/8/832.311.12.de.pdf [in German]
http://www.admin.ch/ch/i/rs/8/832.311.12.it.pdf [in Italian]
http://www.admin.ch/ch/f/rs/8/832.311.12.fr.pdf [in French]
Presidential Decree (D.P.R.) No.321 of 20 Mar. 1956 containing standards for the prevention of occupational accidents and for occupational hygiene in compressed-air caisson work [Italy]
D.P.R. 20 marzo 1956, n.321, contenente norme per la prevenzione degli infortuni e l'igiene del lavoro nei cassoni ad aria compressa [in Italian]
Contents of this Decree: construction and equipment of the caissons and their instruments; health services; work procedures; time limitations on caisson work and rest-period obligations; penalties. In annex: forms to be used in recording the results of medical examinations.
In: L.R. Levi Sandri: Codice del lavoro, Milano: Giuffrè, Italy, 3rd ed., 1974, p.918-931. Also in: Gazzetta ufficiale, 5 May 1956, No.109.
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